list of of fonts

[hvoss49]

luaotfload-tool --force -vvvv --update

lists all my fonts as expected. However, all fonts found in directories different to /usr/local/texlive/... are listed twice:

[...]
luaotfload | db : Loading font ..r/local/texlive/2016/texmf-dist/fonts/opentype/rozynski/comicneue/ComicNeue-Angular_Light_Oblique.otf
luaotfload | db : Loading font /usr/local/texlive/2016/texmf-dist/fonts/opentype/rozynski/comicneue/ComicNeue_Light.otf
luaotfload | db : Loading font /usr/share/fonts/opentype/stix/STIXSizeTwoSym-Bold.otf
luaotfload | db : Loading font /usr/share/fonts/opentype/stix/STIXSizeTwoSym-Bold.otf
luaotfload | db : Loading font /usr/share/fonts/opentype/stix/STIXSizeOneSym-Regular.otf
luaotfload | db : Loading font /usr/share/fonts/opentype/stix/STIXSizeOneSym-Regular.otf
luaotfload | db : Loading font /usr/share/fonts/opentype/stix/STIXGeneral-BoldItalic.otf
luaotfload | db : Loading font /usr/share/fonts/opentype/stix/STIXGeneral-BoldItalic.otf
luaotfload | db : Loading font /usr/share/fonts/opentype/stix/STIXIntegralsUpSm-Bold.otf
luaotfload | db : Loading font /usr/share/fonts/opentype/stix/STIXIntegralsUpSm-Bold.otf
[...]

My luaotfload configuration:

voss@shania:~$ luaotfload-tool --version

luaotfload-tool:
        Luaotfload font management and diagnostic utility.
        License: GNU GPL v2.0.
        Report problems to <https://github.com/lualatex/luaotfload/issues>

luaotfload-tool version: "2.7"
Luaotfload: "v2.7-fix-3"
Revision: "46415b821010269c820f408162a4441616b28345"
Lua interpreter: stock; version "Lua 5.2"
Luatex version: 1.0
Platform: type=unix name=linux
    +  machine: x86_64
    + nodename: shania
    +  release: 4.4.0-59-generic
    +  sysname: Linux
    +  version: #80-Ubuntu SMP Fri Jan 6 17:47:47 UTC 2017
Index: version="2.9" created="2017-01-23 09:00:18" modified="2017-01-23 09:00:18"